Thermal waters in the Lower Yarmouk Gorge and their relation to surrounding aquifers |
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| Institution: | 1. Laboratoire de Géochimie et Métallogénie, Département Géosciences Marines, IFREMER, Z.I. Pointe du diable, BP 70, 29280 Plouzané, France;2. CNRS UMR 6538 Laboratoire Domaines Océaniques, Institut Universitaire Européen de la Mer, Université de Brest, Place Nicolas Copernic, 29280 Plouzané, France;3. IST, Centre d''Etude et de Recherche de Djibouti (CERD), BP 486, Route de l''Aéroport, Djibouti;4. Department of Geological Sciences, University of Florida, 241 Williamson Hall, Gainesville, FL 32611, USA;5. Helmholtz Centre for Ocean Research Kiel, GEOMAR, Wischhofstr. 1-3, D-24124 Kiel, Germany;6. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany;7. Kochi Institute for Core Sample Research, JAMSTEC, Japan |
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| Abstract: | Sources and mineralization of groundwaters from Cretaceous A7/B2 and B4 limestone aquifers in the Golan and Ajloun Heights are derived from conjoint discussion of stable isotopes of water and sulphate, major ion chemistry, rare earth distribution patterns and the (hydro)geological setting. Isotope fractionation of precipitation was used to derive elevation and continental influence of recharge areas. Positive shift of δ18O and δ2H occur due to evaporation before replenishment and the interaction with basalts. Major infiltration areas for Golan Heights are the limy foothills of the Mt. Hermon and for the Ajloun Heights the Plateau itself. To a less degree, precipitation infiltrates also the basaltic catchments. Groundwaters are mineralized by water/rock (i) variably altered limestones by diagenesis, (ii) evaporates and seawater brines enclosed in limestone matrix and (iii) locally occurring basaltic intrusiva. In the Yarmouk Gorge, a deep-seated brine of the Ha’on type ascends and mixes with the fresh shallow groundwater.Contrasting the macro chemical composition, REY distribution patterns indicate the lithology of the recharge areas. Infiltration over basalts results in REY patterns distinctly different to those derived from limy catchments.REY and isotope fingerprints prove that water from the Syrian Hauran Plateau is recharging springs and wells in the lowermost Yamouk gorge. The basaltic cover of the Golan Heights is of minor importance for recharge of the underlying A7/B2 aquifer, which becomes recharged at the foothills of Mt. Hermon and gets confined southwards. Even the wells in the basaltic cover receive water from the underlying limestone aquifer.Anomalous heat flux near the Yarmouk gorge and locally in the western escarpment of the Ajloun may be produced by ascending fluids from greater depth and/or by basaltic intrusions. |
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| Keywords: | Golan Ajloun Yarmouk REY Basaltic intrusions Salination by brines Isotopes |
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